Search for Weakly Produced Massive Long-Lived Particles at NAL
Dec, 1972
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Abstract:
We .have used a directional gas Cherenkov counter, which employed six phototubes to sample Cherenkov light from single particles having a gamma greater than ~lO, to achieve accidental . rates of less than one per day if operated near targets with ~urface radiation levels of as high a~ 10+3 rads. The cosmic ray background measured by our apparatus was reduced to less than one per,day by mounting our directional Cherenkov counter above the irradiated targets and facing toward the earth. Two searches of a few days duration, after bombardments at energies 1016 of 300 BeV and 400 BeV with > protons at NAL, were made in four inch'thick targets of aluminum, mounted just down stream from another aluminum target. No long lived particles were observed with cross sections for production and capture of approxirnate1y less than a micro-micro barn in a lifetime range of a few to a few thousand hours.Note:
- Spokesperson: Frank Nezrick
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